Fountain pen



June 18, 1935.v F. B. CHAMBERLI FOUNTAIN PEN Filed May 6, 1933 Patented-June 18, 1.935

UNITED STATES PATENT' OFFICE Applicatiln al, 669,730

This invention -relates to fountain pens, and shell I6 which is threadedas at II tothe upper more particularly tdfountain pens of the soend ofthe barrel 5, which permits of the recalled self-lling type, which areadapted to be moval of the shell during the filling of the pen filledwith ink without involving the use of sepawith ink in order to provideconvenient access to rate filling appliances, and among the objects thebulb I5. The pen point 8 may be protected 5 of the invention are tosimplify the construction by the employment of the removable cap sectionof such a pen, to eliminate the use of movable I8 which is adapted to beconnected with the parts therein such as valves and the like, whichbarrel by means of threads I9 in order to cover are apt to stick andbecome out of order, and the pen point when the latter is not in use.This 10 to provide a pen which in proportion to its outcap sectionduring the use of the pen may be posi 10 side dimensions is capable ofholding a relatively tioned on the shell I6 in the customary manner.large supply of ink with each filling thereof. The tube I2 is providedwithin the confines of With these and other objects in view, which willthe reservoir I0 and immediately adjacent to the appear as thedescription proceeds, the invenclosure member I4 with arestrictedopening 20 of ltion consists in the novel features ofconstrucconsiderably smaller diameter than the longitudi- 15 tion,combination of elements and arrangements nal opening in the tube I2, theaxis of the openof parts hereinafter fully described and pointed ingbeing preferably arranged at substantially out in the appended claim.yright angles to the longitudinal axis of the tube.

In the accompanying drawing: In the filling of the reservoir In withink, the

20 Fig. 1 is a longitudinal sectional view taken shell I6 is rst removedwhich enables the bulb 20 through a fountain pen formed in accordance I5to be collapsed by finger pressure to effect with the present invention;an expulsion of air from within the bulb. The

Fig. 2 is a similar view on an enlarged scale of air thus displaced fromthe bulb travels downthe upper or bulb end of the pen; wardly throughthe tube I2, thence through the '4 Fig. 3 is a transverse sectional viewon the line port II into the passage 9 and is discharged into 25 3-3 ofFig. 2; the body of inl'r in which the pen point is im- Fig. 4 is asectional View of a modified form of mersed. Due to' the fact that theopening 20 pen. is of very restricted diameter and is disposed The penas shown in Figs. 1 to 3 comprises a substantially at right anglesto thedirection of barrel 5, the lower end of which is provided with a flow ofair through the tube I2, by far the greater 30 neck or finger portion 6of somewhat reduced proportion of air displaced from the bulb isdisdiameter as compared with the main body porcharged. through thelower,endof the pen and tion of the barrel. Within the open lower end ofds not find access into the reservoir I0 through the barrel there isinserted and suitably rethe opening 20. Upon the release of the bulbtained a feed bar 1 anda pen point 8. and'its subsequent expansion, apartial v'acuum 35 The feed bar, adjacent to the pen point, is proisproduced therein so thatfair pressure upon vided with a verticallyextending passage 9 by the body of ink-in which the pen point is imwhichink flow from the ink reservoir I0 of the mersed causes such ink totravel upwardly barrel to the pen point is eifected. Communicatthroughthe passage 9 and thence into the reser- 40 ing with the passage 9 andformed in the feed voir III, although a substantially equivalent rise 40bar is a laterally disposed port II, the upper end of ink takes place inthe tube I2. This opera- -of which communicates with an air displacementtion may be repeated, i. e., the collapsing and tube I2 disposed axiallyand longitudinally within expanSOn 0f the bulb l5 until the desiredamount, the barrel 5. The lower end of the tube I2 is of ink has beendrawn into the reservoir, and

'45 preferably received within a socket formed in the the shell I6 maythen be replaced and the Den 45 upper end of the feed bar I inregistration with used in the ordinary manner. It will be noted the portII, while the upper end of the tube I2 is that thisconstruction avoidscompletely the use mounted in a closure member I3 formed at the of smallmovable members such as valves and upper end of the barrel 5 and rigidlyretained in controlling means therefor and in this respect the anysuitable manner in connection therewith. present invention constitutesan improvement 50 The closure member I3 includes, on its upper surupontheconstruction disclosed in my prior Patface, an upstanding boss Il,with which is conent No. 1,787,896 dated January 6, 1931, not onlynected the open lower end of the collapsible bulb in the matter ofsimplifying the construction but I5, which may be made of rubber orother suitable in rendering the operation more positive andrelimaterial. Normally, the bulb I5 isprotected by a able, since suchsmall movable parts are apt to 55 corrode, stick, break or become out oforder following some use thereof.

A slightly modified form of the invention has been disclosed in Fig. 4wherein a collapsible bulb 2l of the accordion type is secured to theupper end of a. closure member 13a, and is arranged within a. shell 16a.The upper end of the bulb 25 is connected with a plunger 26 which lsadapted to slide in a bearing formed in connection with the upper wallof the shell I 6a. The end of the plunger which projects beyond theshell Ia is provided with an operating knob 2l, normally disposed in aremovable cap piece 28 carried by the upper portion of the shell IGa.Also, in this form of the invention, instead of forming the tube |20.with an opening as indicated at 20 in the preferred form of theinvention, th'e closure member" I3a is formed with a small tube 29having its upper end terminated in a right angularly bent portion 30,arranged within the confines of the bulb 3,8( The principles ofoperation of this modified form of the invention are precisely, the sameas that found in the preferred form, in that owing to the relativelysmall diameter of the tube 29 and to its right angularly bent po1' tion30, air displaced from the bulb rapidly passes through the tube |2ainstead of entering the upper portion of the ink reservoir. The

diameter of the tube 29 is sufilciently large however to vent the upperregion of the ink reservoir and to allow for the gradual rise of ink insaid reservoir by the repeated expansion and collapsing of the bulbwithout air compression. It will be understood that the severalconstructions herein shown and described are subject to some variationor modification without departing from the scope of the invention as thelatter has been defined in the following claim..

What is claimed is:

A fountain pen comprising a barrel provided with an internal inkreservoir, a ported feed bar formed in connection with the lower end ofsaid barrel, the ports in said feed bar establishing communication forfluid ilow between said ink reservoir and the atmosphere, a closureformed at the upper end of said ink reservoir, a' bulb carried by saidclosure, and a tube extending longitudinally of said barrel andestablishing tluid flow between the interior of said bulb and the portsof said feed bar, said tube adjacent to said closure being. providedwith a restricted, valveless opening possessing a diameter materiallyless than that of said tube, the axis of 2 said opening being disposedsubstantially at right angles to the longitudinal axis of the tube.

. FRANK B. CHAMBERLIN.

